Site Settings let you change settings for your app.
You can change the size of the icons that appear in the header/footer for your tables.

userid:

stylesheetid:

mailboxid:

mailformatid:

languageid:

regionid:

cityid:

icontheme: This is the folder from which you can set icons for inbuilt icon themes. Two icon sets are available medium icons at 32x32 pixels and mini icons at 16x16 pixels. To change from one size to another, simply replace the 16x16 for 32x32 or vice versa.